/Engine/Source/Runtime/Datasmith/CADKernel/Public/CADKernel/Topo/Topomaker.h
this will eventually be reconciled with what the Geometry team is using.
namespace UE { namespace CADKernel { enum ESewOption { None = 0x00u, ForceJoining = 0x01u, RemoveThinFaces = 0x02u, RemoveDuplicatedFaces = 0x04u, All = 0x07u, } } }